When you affix a bar of Irish Spring soap to the floor of a shower with either a nail or glue and then hide and wait for someone to try to pick it up. When they bend over to retrieve it you jump from the shadows and yell "Irish SPRING!!!!!!" and then proceed to anally rape them.

When you use a potato as a condom and then have sex. The blood that will be pouring out afterwards collects in a pool and eventually streams down the side of the bed. The bleeding vagina or the pool of blood can hence be called, an "Irish Spring".

Back in Ireland, we didn't have condoms. Instead, we used potatoes. And you know that afterwards the girl would be bleeding a river. Now that's a REAL Irish Spring.

When a man is giving a woman anal and does not want to get poop dick, right before pulling out, he punches her in the ribcage causing her to tighten up her sphincter muscle and when he pulls out, he makes a popping sound with his finger and mouth and says "Clean as a whistle" and whistles the Irish Spring theme.